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Science 3200 Unit 1 Notes 1.1 Chemistry is the study of the composition, properties, and reactions of matter Matter is Matter can be grouped based on two types of properties Physical Properties & Chemical Properties Description Examples Chemical reactions happening around us: 1. 4. 2. 5. 3. Two systems designed to help us use hazardous chemicals safely are: 1. WHMIS 2. HHPS Three ways WHMIS provides information 1. 2. 3. Science 3200 Unit 1 Symbol Notes 1.1 Meaning Science 3200 Unit 1 Notes 1.1 Chemists try to classify matter based on its ____________ and its _____________ Two types of matter are pure substances and mixtures Pure substances Mixtures Define Examples Pure substances Substance Atom Molecule Element Compound Explanation Example Science 3200 Unit 1 Notes 1.1 Classifying Mixtures Explanation Homogeneous (Solution) Heterogeneous Examples Science 3200 Unit 1 Notes 1.1 Compare physical and chemical changes Physical change Description Examples Describe 4 pieces of evidence for a chemical change 1. 2. 3. 4. Describe how you can test for 3 commonly produced gases Oxygen Hydrogen Carbon Dioxide Chemical Change Science 3200 Unit 1 Notes 1.1 The periodic table is an arrangement of elements according to atomic number The periodic table is used to 1. 2. Define Atomic number Period Group/ family Metals and non metals are separated by a “staircase” Metals Non metals Physical Properties Chemical Properties Nobel gases are very unreactive Write the name, symbol and atomic number for 3 metals Science 3200 Unit 1 Name Notes 1.1 Symbol Atomic Number Write the name, symbol and atomic number for 3 non- metals Name Symbol Atomic Number Write the name, symbol and atomic number for 3 noble gases Name Symbol Atomic Number Science 3200 Unit 1 Notes 1.1 Atoms contain 3 types of subatomic particles Subatomic Particle Symbol Charge Mass Location Determining the number of subatomic particles Subatomic Particle How to find the number Equals to the atomic number Example Ca 20 Equal to the number of protons because the charges balance Equal to the atomic mass minus the atomic number Atomic Structure • Protons and neutrons are inside the nucleus (centre) • The electrons are arranged outside of the nucleus in levels • Each energy level can only hold a certain number of electrons 1st-2 2nd- 8 3rd-8 How to Draw Bohr Diagrams 1) Draw a small circle- put the symbol in the centre 2) write a small p and the number of protons below the symbol write a small n and the number of neutrons below this 3) Draw a circle around the nucleus 4) Add dots to represent electrons – start from inside to outside 5) Continue until you’ve draw the correct number of electrons Draw Bohr diagrams for the first 20 elements 40 – 20 =